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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A385874 a(n) = 1 + Sum_{k=0..n-1} binomial(k+1,2) * a(k) * a(n-1-k).

Table of values

n a(n)
0 1
1 1
2 2
3 8
4 57
5 639
6 10357
7 229588
8 6686619
9 248013315
10 11425386222
11 640413284553
12 42933889931191
13 3393203732253145
14 312268381507616935
15 33107736233111305459
16 4006699123399932333697
17 548987463226205098599755
18 84552444466155546810368421
19 14544161652321384236939516147

List of values

[1, 1, 2, 8, 57, 639, 10357, 229588, 6686619, 248013315, 11425386222, 640413284553, 42933889931191, 3393203732253145, 312268381507616935, 33107736233111305459, 4006699123399932333697, 548987463226205098599755, 84552444466155546810368421, 14544161652321384236939516147]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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